@mixin bg-img($url) {
  background-image: url($url + "@2x.png");
  @media (-webkit-min-device-pixel-ratio: 3), (min-device-pixel-ratio: 3) {
    background-image: url($url + "@3x.png");
  }
}
@mixin border-1px($color){
  position: relative;
  &::before{
    display: block;
    position: absolute;
    width: 100%;
    bottom:0;
    left:0;
    content: "";
    border-bottom:1px solid $color;
  }
}

@mixin clear() {
  &::after{
    display: block;
    height: 0px;
    width:100%;
    content: "";
    clear: both;
  }
}

